Rosalind Russell stars as spoiled Washington socialite Jo McBain who joins to WACs to be near her boyfriend, certain that her daddy will pull some strings to land her a soft commission in the officer's corps. Instead, father plans to teach the girl a lesson, leaving the horrified Jo to withstand the rigors of basic training on her own. She is convinced that things can get no worse when her ex-husband Andrew appears on base in charge of a secret testing unit…and determined to win Jo back. When Jo gets assigned to Andrew's test group, he tightens the screws to undermine and destroy any possibility of romance between her and the Colonel.